(N.B. I made the previous post purely to get a timestamp - the "failure to create a thread" happened a few minutes before that and from the same computer, so that may help you identify the log entry.

I did not have an image in the post, so the thought that it might be to do with images is incorrect.

However, when I eventually managed to create the thread (having retyped everything) the title was truncated (I think I'd used double quotes " around part of the title,and when the thread was created the first " and everything after it had vanished). So the problem might have something to do with titles that are too long, and/or specific characters in the title.

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).