Option Log at Completion enabled and greyed out

[Pulp]

Last Friday I came across a strange and very annoying problem with the LabVIEW development environment.

 

I am working on a project of a customer. Last Friday, while debugging it suddenly asked me to enter a name to log data when I stopped the program. I cancelled it, but the next time I tried to start the program it asked me again, and when I cancelled it stopped with a popup message like "Cannot log front panel of VI. There is no log file associated with VI ...".

 

Google came up with this message, which suggested that menu option Operate->Log at Completion was enabled. And indeed, it was, but greyed out, so I could not disable it. Hm, something seems to be corrupted.

 

So I checked older versions of the program - all with the option enabled and greyed out. Then I restarted the LabVIEW development environment - but without success. Then the computer - didn't help either. Then contacted NI support. They hadn't heard of the problem, but suspected the VI was corrupted. They suggested to disable the log option by copying the block diagram into a new VI. And indeed, the option Operate->Log at Completion was disabled and not greyed out. Problem solved.

 

Nevertheless:

- How can an option be enabled and greyed out?

- Why didn't it start logging before? I have run many versions of the program many times, at different computers - even NI support has run it, and didn't encounter the log file storage question.

- And why has it gone away? I started an old version of the program (with the option enabled) this morning to describe the behaviour, but it didn't ask for a log file anymore.

 

Greetings,

Bart

[Aristos Queue]

That's a flavor of weirdness I've never heard of.