Strange undo behavior

[Mythilt]

Check Tools->Options->Environment and make sure that Maximum Undo steps isn't accidently set to 1.

Edit:

Oops, just saw in the Opening post that you set it to 99.  Does it have the same effect when you set it to default or 10?  99 might be over a limit or something.

Message Edited by Mythilt on 08-05-2008 12:54 PM

[wd8ivl]

Jon D,

I can set the undo to any number, but only in this one vi (the main vi of my program) I have only one undo.  The subvi's all have multiple undos, and other vis I open have multiple undos. 

And if I open this one vi on other PCs, it still has only one undo...

Strange!

Mike

[Brinoceros]

Hi All,

As was mentioned earlier in this thread, there are a few known instances, and possibly some stranger unknown ones, where the Undo list is cleared.  There was a fix applied in LabVIEW 8.6 to try to address this issue.  Hopefully the behavior you are seeing is now fixed in 8.6!  And I apologize for any inconvenience this has caused.

Cheers,

[wd8ivl]

Brian,

So I guess the undo list is somehow tied to the VI, and this particular VI will not allow an undo list greater than one item.   Strange...

Thanks,

Mike

[skorskor]

Just curious Mike - what is the function of your VI? Mine is using ActiveX to work with some Excel spreadsheets, in LabVIEW 8.5.

[wd8ivl]

It's the main vi of my application.  It's got about 200 subvi's in it...and all of them can have multiple undos...but the main has only one.

Mike

[Larry_Stanos]

Six years after the original post, now running LabVIEW 2013 SP2, and this problem apparently still exists for some of us.  I have a top-level vi created in an older version of LabVIEW (recompiled to LV 2013) which allows only a single undo step while its sub-vi's and other top-level vi's permit the maximum number of undo steps as specified under Environment Options.  An explanation or solution would be much appreciated.

[SnowMule]

As soon as you Save the VI, the undo history is lost. 

LV builds the undo steps, up to the specified limit, until the VI is saved.

[altenbach]

Can you attach a simplified version of the VI that only allows a single undo step?

[Larry_Stanos]

Inexplicably, after some extensive editing, the top-level vi that previously supported only a single undo step now supports multiple undo steps.