I've never had this problem before! Converting files from 48, 24 to 48, 32(float) I receive this error and it won't proceed. I have other audio file tools that work better with 32 float.
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Assertion in "/Volumes/Development/124699/ProTools/NewFileLibs/FileFormat/MacBuild/../../FF/Audio/Processing/FF_AudioProcessWriteFiles.cpp", line 622.
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Tells me to copy it but doesn't tell me where to send it. Sounds like something the software developers might want to know about...