How to handle version changes? Strategies?

We're struggling with version change issues. Most recently we tried to move from 8.5 to 8.6 and lost about a week of project time while we tried to make it run well. The problem was that the Development Environment would crash several times a day while doing block diagram edits, losing unsaved changes. We never found any clues as to why. It would be one thing to debug a VI that crashes, but when it is the LV editor itself that is crashing, how do we work on that?
Anyway, we have a policy here of freezing software updates for projects that are close to completion, because buggy updates so often delay project completions, and this triggered a return to 8.5, which is where we remain now on that project.
But now we can't install and use the VI Analyzer we just bought on any of the PCs tied to that project, as it demands 8.6. I do have one PC that is completely disconnected from this project, and it runs 8.6, so running the Analyzer there may be useful, but still messy.
How do you handle version changes? How often do you try to follow the updates? How often do you need to go back a version? Do you maintain different versions? Is it even possible to run multiple versions on an individual Win XP PC?
Thanks!

I have installed several versions of LabVIEW on my system.
Most of the toolkits are only installed in the latest versions. There are ways to install toolkits on multiple versions.
And I think that toolkits as of LabVIEW version 8.6 can be installed on several LabVIEW verions.
Ton
Free Code Capture Tool! Version 2.1.3 with comments, web-upload, back-save and snippets!
Nederlandse LabVIEW user groep www.lvug.nl
My LabVIEW Ideas
LabVIEW, programming like it should be!

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