Can't open multiple AI files at once (sort of)
I'm having a similar problem to this, everything worked fine until about a week or two ago. While opening a file (ai, eps etc.) by double clicking and then opening another file, the second one won't open.
However, unlike the person from the previous thread, when I launch Illustrator first (without opening any file) it will work fine (multiple files open as expected) - so that's my workaround for now.
• Windows 10 Pro 64 bit, ver 1703, OS build 15063.540
• Illustrator ver 21.1.0
• Recent Windows updates include: KB4034674, KB4034662, KB4025376, KB4025342
• Restarts don't help
• Adobe Cloud is running fine
- What exact operating system version & illustrator version are you on?
- Did your OS recently get updated?
- Did you restart your computer?
- Is your Adobe Cloud running with no errors?

