Re: Removing linear zero in Architecture dimension.
This indeed seems not to work.
I opened a test drawing made in LC with a 1' square, dimensioned with Remove 0' and Remove 0'', in a different CAD (Nanocad). There at first it showed wrong also, though the properties said zero feet suppressed and zero inches suppressed. Funnily, I did a Copy Object Properties from one of the dimensions to an other one, and then the target dimension suddenly displayed properly!
I saved the drawing and reopened it in LibreCAD hoping it to be fixed there also, but nope.
So this is a real bug. Remove 0' and Remove 0'' is written into the file but not executed right.
LibreCAD and the source it is a fork of, Qcad, are of European origin and so the matters of feet and inches might have not got full attention. Some US-developer please...