I have already report this bug to customer service where they said to let you know about it so I jsut copy paste the issue here which is when I export on T-Pose cc4 can't create fbx file. I have picutre of the workin and non workin export settings too.

I tested default characters that comes with cc4. I exported as All (character / prop / camera)
with embedded textures all worked just fine now.

Talkin Kevin project
worked, but the (I quess it is ) face bones were super huge

Camilla facial Demo
worked, but the (I quess it is ) face bones were super huge

SkinGen-Makeup
worked

SkinGen_Skin (Male)
worked, but some bones on the back of the head were super huge

I tested 2 of my own characters and both worked


All character exported with the workin settings worked, but when I choose the "not workin" settings on the picture then all of them fail to make the fbx file.
check the picture from comparison. both cases I did use All (character / prop / camera) also.

BUT

If I first choose either clothed character or selected then it's possible to export with the T-Pose.
I lastly tested to export with the non workin settings, but kept the A-Pose and that works so it seems that the T-Pose is the one that glitches the exportin.
I tested all settings many times and all is consistent of what I observed.