Ctrl-tab not functioning

Hello, I'm using a brand new MacBook Pro (15" with Touch Bar and Mac OS Sierra) and I have installed Parallels Client 15.5 (build 16129).
Since my upgrade to a new MBP I'm no longer able to use ctrl-tab in the parallels client, which is really annoying. Is this a bug or is there a shortcut I need to define for this application?
I don't know what's causing this problem: my new Mac, Sierra or this version of Parallels Client...
Update: I installed an older version of the Parallels Client and the old version doesn't have the problem...

Can anyone help me out? Thanks a lot!

 

Hello @PietP1
I believe that it may be the case when you do note have keyboard shortcut for Ctrl button configured.
In Parallels Client please navigate to Preferences menu - 'Keyboard' tab and make sure that shortcut is configured.
Let us know if the issue would be still presented.