Have you tried to preass “Check now”. Maybe the process stucked.
Can you check once by removing the limit to current tab option.
Check the project directory in your windows file explorer. Right-click the name of your project-directory → select SVN → select Resolve conflict. See if it has any conflicts.
If no conflicts, then you still have the option of renewed downloading your project, make a small change, and try to commit. See if that works. If so, next step is to take your current *.mpr and copy-paste it over your newly downloaded *.mpr. After that, try committing again.
Hope it helps