Hi
Actually now that you mentioned exceeding 3000+ files i noticed it might have something to do with extensis suitcase plugin and fonts actually.
I have extensis suitcase and its plugin for adobe cc that creates its own font browsing panel inside photoshop, illustrator, indesign and i have tons of lines as below in the console, all related to affinity photo beta and suitcase, i did not realize these are related to my problem but since i have all fonts activated that could explain exceeding the maximum file limit here. I am lazy so i usually don't make font groups and activate / deactivate as needed since i haven't noticed any notable performance hiccups anyways even if i have all fonts loaded. But hmm maybe i should =)
Here an example of one of those lines in console, all are similar and related to photo beta and suitcase:
02/04/15 18:28:39,602 Affinity Photo Beta[1185]: could not consume extension for /Users/ramit/Library/Extensis/Suitcase Fusion/Suitcase Fusion.fontvault/SA/l/OTPS/Adobe Systems/MyriadPro-SemiboldSemiCn/2.037/4276478249/MyriadPro-SemiboldSemiCn.otf (12:Cannot allocate memory)
02/04/15 18:28:39,602 Affinity Photo Beta[1185]: failed consuming extension 0 of 39
"Do you have any other application's open that are also Sandboxed?"
This i don't know since i have minimal knowledge of OS X sandboxing. If fonts are eating sandboxing resources is there a way to fix that without deactivating most of fonts or should i just deactivate those i don't never use anyways?
Rami
EDIT: i tested deactivating most of my fonts and problem solved =) both designer and photo work as should now. It would still be interesting to know why affinity apps conflicted with suitcase and fonts like this since i haven't run into similar problems with any other software. Anyways thanks Andy, i would not have thought of fonts without your input.