VI not loadable any more

HI,
I have been converting a project from LabView 8.5 to 8.6.1 and have been replacing a self written class by another one. While working on this and updating a subVI LabView crashed. When I restarted LabView I could recover some of my work. Later I tried to open the main VI of the project  and LabView crashed immediatly. The main VI was normally saved before LabView 8.6.1 crashed for the first time. So I wonder what could have happened? Is there any chance to recover the main VI and the work which I spent on the main VI?
The same happened to another VI which I never have opened in LabView 8.6.1 But when I copied the 8.5 Version of this VI again to the new project folder (using the Windows Explorer) I had no problems to open it. While working on my project in LV 8.6.1 I once used "Save all (this project)". Any explanation what could happened, how to avoid this and how to recover such VIs?
Regards,
 Jörn

Jorn,
Yep- it can get pretty tricky to upgrade versions of LabVIEW.  IMHO the BEST (safest) way is to follow this procedure;
1) Backup everything on a machine that still has the old LV version.
2) Install the LabVIEW version to move to.
3) Use tools>mass compile> all of your reuse code (pay attention to the warnings and address them individually)
4) Use tools>mass compile> all of your drivers (pay attention to the warnings and address them individually)
5) Use tools>mass compile> each your projects (pay attention to the warnings and address them individually)
a bit more time consuming than just opening and resaving---unless there are conversion issues that crash the enviornment. 
Jeff

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