Problem changing owner of a VM. In particular there doesn't seem to be error showing in UI, but dialog box is not coming up. production.log on CP may show 500 error for full_name (no implicit conversion of nil into string ).
Related issues are some pages of UI give 500 errors, or only for some users, or even single user gets 500 error trying to log in.
All versions of OnApp so far (3.5.0 confirmed )
Error for conversion of nil to string for full_name indicates that for some user, users.first_name and/or users.last_name is set to NULL. These fields are required to not be null - they can be set to a space ' ' or even to nothing but should not show in the database as "NULL" or "NIL" when listed out.
The fix is to many find and change the user name in the database so the field is not null - it can be set to some default value instead and then edited further from the UI if needed.
For some 500 errors, there are other causes as well - missing virtual machines, bad joins, so forth. The log on the CP at /onapp/interface/log/production.log should be examined for the most likely error and investigated further. This information only covers case for user's full name can not be concated by the CP logic.