I have two effects which work in C3 with the 2.5 runtime, but they do not work (bad render) using the C3 runtime. Is there documentation on what changes may be required for effects for the C3 runtime?
I think the only difference is a few of the built-in uniforms changed. See the supported effect uniforms here and make sure you only use the documented ones as described.
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Here's my tips on converting effects from C2 to C3:
construct.net/en/forum/construct-3/plugin-sdk-10/dropshadow-effect-ported-c3-142753