@Philibb
Any other context to go on...like I said, I use both packages personally every day. I second the post suggesting to add Java 2014-001 for sure. You MUST have that installed on 10.10.x to run Adobe Illustrator CS 6 period and I do occasionally use that part of the suite. Other context from you might help to pin this down. Can you reproduce the problem as an admin user on the machine? I ask that as it might be a stupid permissions issue...I have users using this as a standard user as well though. Is there any particular thing you can do as the end user to force this problem. I'm happy to try it on my setup here. I can go into what I did a little if it helps. I have found though that if I build mine right, I can at least use MS's update packages without hurting anything.
For one, I don't use Microsoft's PKG exactly how it is...never have. MS's package works, but not exactly to my liking. What I did for Office 2011 (we use the Office 2011 standard vol licensing version) was to snapshot capture it (yes...I know Composer isn't everyone's favorite on this forum, but it serves the need here on my end thus far) on a clean machine and tweak it very heavily. For starters, I before laying down Office at all, I run a pre-install that removes any MS-supplied fonts lain down by previous versions and known current versions similar to this:
#!/bin/sh
PATH=/bin:/usr/bin:/sbin:/usr/sbin export PATH
# To remove duplicate Microsoft fonts
rm -R -f /Library/Fonts/Microsoft
rm -f /Library/Fonts/Arial Bold Italic.ttf
rm -f /Library/Fonts/Arial Bold.ttf
rm -f /Library/Fonts/Arial Italic.ttf
rm -f /Library/Fonts/Arial.ttf
rm -f /Library/Fonts/Brush Script.ttf
rm -f /Library/Fonts/Times New Roman Bold Italic.ttf
rm -f /Library/Fonts/Times New Roman Bold.ttf
rm -f /Library/Fonts/Times New Roman Italic.ttf
rm -f /Library/Fonts/Times New Roman.ttf
rm -f /Library/Fonts/Verdana Bold Italic.ttf
rm -f /Library/Fonts/Verdana Bold.ttf
rm -f /Library/Fonts/Verdana Italic.ttf
rm -f /Library/Fonts/Verdana.ttf
rm -f /Library/Fonts/Wingdings 2.ttf
rm -f /Library/Fonts/Wingdings 3.ttf
rm -f /Library/Fonts/Wingdings.ttf
I then lay down a DMG package containing the repackaged Office 2011 14.4.8 in DMG form (similar to this Composer window included below). I'll note the User folder contents...I use Casper's FEU and FUT functions to prepopulate the user template and existing users with the correct set of font collections that need to be there for an Office 2011 user. I also include all the MS package receipts as part of the DMG so future MS updates will run properly.

Finally, I lay down my own in-house LaunchAgent/script combo that personalizes office 2011 appropriately for whichever AD user is logged in. I'm happy to share if you are interested...not really a rocket science script/launchagent just one cobbled together after almagating advice from JAMF Nation and other sources
Adobe CS 6, I've done totally Vanilla using the AAMMEE 3.1 kit.
When I lay it down in that order, I seem to be fine running Word and Excel daily and running Photoshop and Illustrator every other day or so.
If I can help I will or if you just want me to try a particular task to reproduce your issue on my 10.10.2/Adobe CS6/Office 2011 combo I will. If not, that's what I manage to do here.
blackholemac