What happens when you try?
Well while InDesign was starting the cursor showed the rainbow wheel all the time and when I found out that I couldn't do anything in InDesign, I tried to shut it down since it crashed.
For the moment, 24 hours and an iMac shutdown (I gave it some sleep last night ) later, it seems to run smoothly although yesterday it didn't help...
I I have the very same problem.
I have a client who needs some files, she is on CS6 so I exported them as IDML (I have InDesign CC 2014). She can't open them, I can't either. The application open normally but the file doesn't shows up, the application is not responding, so I forced quit it.
I try to export them on another computer with InDesign CC (not 2014), doesn't work. I restarted the computer, still doesn't work. I tried the "save as IDML" instead of Export, still doesn't work.
While I was writing this message, I let InDesign CS6 running even if it "was not responding" and after like 5 minutes, the file opened...
InDesign is taking its time for writing and opening IDML files. I had one file with a lot of formatted tables in it, that took nearly one hour to write and nearly 20 min. to open. So be patient…