Vernier Software and Technology
Vernier Software & Technology
Tech Info Library

Logger Pro won't launch or crashes or hangs when you attempt to start. (advanced)

If Logger Pro is crashing with a specific error message, check to see if the error message is listed here:
TIL 2089: Logger Pro Troubleshooting and FAQs

Most Logger Pro startup related issues are caused by bad installations. As such, the first thing to try is uninstalling Logger Pro and reinstalling with our installer.

Also, make sure you are using the latest version. Some old versions of Logger Pro don't work on new operating systems. You can find updaters here:
If you need a full installer for the latest version, you can access that from your account:
TIL 2716: How do I access Logger Pro 3 installers and passwords from my account on the Vernier website?
You can also contact us.

If Logger Pro is crashing and it shows a dialog box with a button that says "Send Error Report to Vernier", press that button and fill out the form with your name and email address. Note that those reports don't always get analyzed immediately (unless you contact us and someone goes looking for them), but they do contain detailed information about the crash, so, for diagnostic purposes, submitting that information is often times helpful.

Certain antivirus software (depending on the settings) will sometimes cause problems with Logger Pro. When this is the root cause, the antivirus software generally puts up a rather obvious message to this effect, but it is often useful to disable antivirus and launch Logger Pro just to rule out that variable.

The next thing to try is other software that Logger Pro interacts with. Logger Pro interacts with several programs for various reasons:
1) Bonjour (Apple mDNS software for data sharing)
2) LabVIEW (we don't interact with it, but some data collection hardware use common libraries)
3) If you are running version 3.10.1 and below: QuickTime
Even if you aren't using those features of Logger Pro, if those pieces of software are on the computer and malfunctioning in some way, (which may not be obvious by running those programs directly) they can cause Logger Pro to malfunction.

Uninstalling and reinstalling those pieces of software often fixes the issue. QuickTime related issues are the most common, and it is the easiest to uninstall/reinstall. LabView related issues are very uncommon, and it requires the most work to uninstall/reinstall.

If that doesn't work, then we'll need some logs from Process Monitor. Process Monitor is a Microsoft tool that tells you whenever any program on Windows interacts with another program, loads a dll or data file or even reads a registry key.

You can download Process Monitor here:

Unzip it and run it, and press OK to the default filters. It will start recording immediately. Launch Logger Pro, wait until it crashes, and then go back into Process Monitor and click on the disk icon to save the file. The file will probably be huge (100+MB isn't uncommon). Zip the file up though, and it will probably be a lot smaller, around 10MB. Exactly 10MB is the limit for most e-mail programs, so the log file may be too big to email, but you can upload it to Vernier's file uploader. If you have slow upload bandwidth, compressing the file will help you email it much quicker.

Analyzing a Process Monitor log file is sometimes tricky. Different versions of Process Monitor exist and can't read each others' files, so generally it is best if everyone is using the latest version. Process Monitor generates very verbose log files, most of which is useless to what you need. Process Monitor does have good filtering choices though. You can type things into the filter, but it is generally better to use the right-click menu. If, for instance, you see that SearchIndexer.exe is running a lot (and probably isn't a factor in the problems), you can right-click on "SearchIndexer.exe" and choose "Exclude SearchIndexer.exe".

For various reasons Logger Pro doesn't always crash on the last listed line of LoggerPro.exe that you see in the log file, but that is typically where you should start looking for information. For instance, if Logger Pro is crashing just after opening QuickTime libraries, it is probably QuickTime related.

Common things you'll see in Process Monitor:
-svchost.exe: everything that runs as a "Windows Service" runs as this. Unfortunately, excluding it sometimes means you'll miss things.
-Logger Pro looking in a bunch of different folders that don't make sense. It does that when it starts up; it is finding things like fonts and device drivers and it doesn't always know exactly where to look so it just tries things alphabetically.
-A lot of error messages like "File locked with only readers", "Unexpected End of File", and "Buffer Overflow". Many of those are normal, (it may not need to write to the file, or it may be reading in chunks and reached the end of the file in the middle of a chunk or just want to check that the file is there and used a 1 byte buffer to read it). Obviously if Logger Pro isn't launching then some of them are not normal; you may need to record your own log file of Logger Pro launching normally to compare things against.
-The antivirus software looking at LoggerPro.exe file (totally normal). Keep in mind that the antivirus exe's name may not be obvious without googleing it.
-dwwin.exe or drwtsn32.exe: This is a Microsoft crash handler program, if you see that, Logger Pro has already crashed and Windows is cleaning it up, (look higher in the log file for the root cause).

Note that "Tools" Menu, "System Details" will tell you things like Windows version and the like. This is sometimes helpful to check, and you can right-click on lines in Process Monitor and choose Properties to see a lot more information about individual line items.

Process Monitor can be used for diagnosing other things besides crashes. For instance, font issues will show up in Process Monitor: it will list what files it tried to read, and obviously if the fonts weren't there then it won't be able to read them. Of course if you know that it is a font issue, then just searching on "font" will make it obvious, it loaded those there, but if you are trying to search the thousands of lines in the log file looking for something out of place, you'll have trouble.

TIL 2892: Windows: Logger Pro hangs/crashes when I start it or takes several minutes to come up.
TIL 3225: Logger Pro can't find QuickTime even after I've reinstalled it.

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