If anyone can offer any possible solutions I'd be really grateful.
Indesign suddenly will only successfully open if I hold down Ctrl+Alt+Shift and open it without preferences. I've deleted my preferences as per the links in the forum, I've uninstalled and reinstalled and I haven't added any new fonts in a long time.
Without using the 3-finger salute the application opens and draws the menus and the background and then simply becomes unresponsive. The only hint I have about what might be going on is that sometimes the window for the application looks to be WAY larger than the screen - and I'm on a 4k monitor so I wonder if it's something to do with the built-in UI display scaling causing the problem?
Like I say this is a bit of a drag and if anyone has a suggestion I'd love to hear it.
Sounds like a software conflict. Any non-adobe plugins installed in ID?
Chrome browser plugins and some security software are also know to cause problems.