I think you will have to wait until Adobe brings up an update or bugfix or the next version. I think, people who have updated to Sierra so fast did not consider those problems which always appear with system upgrades and Apple has also a very bad history of incompatibilities with system upgrades and existing programs. Someone who has critical work to do should always wait until all important applications are adapted to the new OS.
since you have updated your os, i suggest that you once delete your indesign preferences and cache and then try relaunching. Also ensure to empty your trash before launching ID. Hopefully, it will work fine then.
PS: this will delete all your saved preferences if any.
I’ve the same problem. But on a freshly installed system (Sierre 10.12.5).
I work with the latest version of Indesign. In Photoshop, I’ve almost the same problem. There remains only the shadow of the splash screen hanging. Also annoying.
The daily, additional restart of the program helps.
Is there no solution? Deleting the preferences is always nice. But with a freshly installed system this is not a logical solution.
Emma, on this forum, found a solution to this problem which she told me about just yesterday or the day before. (It solved the problem for her and for me so hopefully it will work for you, too.)
I am quoting what she said below:
I think I've found a solution to splashscreen.
I spent all morning with Adobe online help, but stumbled on it accidently.
For me - it was to do with login items. I got rid of indesign from User & Groups login items and threw away login preferences (com.apple.loginitems.plist) and it's sorted.
Hope this works for you.