Cannot update backup options in Parallels 7

I am currently running Mac OS X Lion along with Parallels 7.
Both OS and Parallels have the latest/greatest patches.

I use Time Machine and an external USB hard drive for the usual backups.
Most of the time, "Do not back up virtual machine with Time Machine" is checked.
Otherwise the .pvm file would be backing up all the time.
Once per week, I stop the Windows 7 virtual machine, compress it, then uncheck this option and run a Time Machine backup manually.
I've been doing it this way for some time.

Now, when I go into the Configure pane for backups, there is NO 'OK' or 'Cancel' option, to save or cancel the change.
If I uncheck the option, close that window, and reopen, the option is checked again.
If I uncheck that option, click the lock to "prevent further changes", the option is checked AGAIN, even though I just removed it, before I close the window!

Am I missing something here?

Any advice would be much appreciated.

 

Same thing happens to me, it won't save my changes.

 

Same thing happened to me yesterday. I had that option checked. But I had also set Time Machine not to backup anything in the Parallels folder. I decided to backup the VM with TM. Opened Parallels Backup configuration, removed the check next to Time Machine backup option, but I noticed it was checked again and again and again. Time Machine preferences was opened at the background, I removed the Parallels folder from Time Machine preferences (Options) closed, quit System Preferences, opend the Parallels Backup configuration, removed the check and this time it worked.

I also set Smartguard to optimize for TM, this way TM only backups changed parts, not the whole VM.

 

Tried everything like you said and it still won't stay unclicked. Could you write it with a little more detail step by step?

 

Unfortunately, there're no special steps to make it work. Mines were coincidence, suddenly the checkmark dissapeared while I was playing with TM preferences. It shouldn't be so hard to uncheck an option in Parallels' configuration, tech support should be looking into this problem.

 

I didn't mean special steps just things like was the VM open or closed for example. That's what I meant by more details.

 

VM was closed while I was trying to clear the checkmark.

 

I'll try anything at this point. I don't want to have to drive 2 hours to another genius who turned off backing up my VM in Time Machine to begin with. Thanks.