Operating system: Darwin-16.7.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon R9 M295X OpenGL Engine ATI Technologies Inc. 4.1 ATI-1.51.8
Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-16 23:08, hash: rB12da679fa094
Short description of error
I used dynamic paint to create an image sequence texture, which I was using as a mask to drive hair growth size from the particle system. If I do it this way, things render out correctly, but I cannot see any hair particles inside the viewport, so its impossible to check my work before I render.
Exact steps for others to reproduce the error
-Create Plane and Cube, animate cube across plane
-Set Cube to Brush, Plane to Canvas with Dynamic Paint
-Brush Paint color White, canvas material Black
-Set canvas format to image sequence and bake it out
-Create hair particle system on Plane
-New Texture for Particle system, import create image sequence
-Set texture to drive size only
Now, if you change any of the hair settings, you cannot see the hair in the viewport and can only see upon export.