Lost functionality

[martifingers]

My version of affinity Photo has stopped working in crucial ways.

First sign was loss of link to Affinity Publisher.  After that I lost (and could not recover) the image adjustments such as levels, curves etc. and also many option with the View/Studio panel were "greyed out".  RAW files could be loaded but not "developed" in any way and there was no option to cancel the operation meaning that I had to use Task manager to even close the program.  

Any idea what has gone wrong?  Also worringly I am not able to uninstall the program !  The uninstall process stalls at "Preparing to remove". 

[walt.farrell]

2 hours ago, martifingers said:

First sign was loss of link to Affinity Publisher. 

Please explain more about that. The only link from Photo to Publisher is via File > Edit in Publisher.

Publisher, however, has both File > Edit in Photo and the Photo Persona.

2 hours ago, martifingers said:

After that I lost (and could not recover) the image adjustments such as levels, curves etc. and also many option with the View/Studio panel were "greyed out". 

A screenshot showing the workspace and the pulldown from View > Studio would help diagnose that one. But perhaps you've used View > Hide Studio (which would explain things being grayed out). But before you do anything to fix, please keep reading.

2 hours ago, martifingers said:

RAW files could be loaded but not "developed" in any way and there was no option to cancel the operation

That sounds like you don't have the Context Toolbar showing. View > Show Context Toolbar would fix that. But first: Combined with the rest of your description (but not definite without a screenshot) perhaps you've hidden the User Interface by pressing the Tab key (shortcut for View > Toggle UI). If so, pressing Tab again would bring everything back.