Starting in December, we will archive content from the community that is 10 years and older. This FAQ provides more information.
An illustration or demonstration file might help illustrate what isn't working.
Also, try to be specific in your use of AutoCAD specific terminology. THICKNESS relates to the height of a virtual plane of the line when viewed in 3d. It is used along with ELEV. THICKNESS has nothing to do with lineweight.
If you mean LINEWEIGHT, then use that term. If you mean width of a polyline, use the term WIDTH.
If you're trying to use a block to mask over a line, the mask, when using a wipeout must:
Since wipeouts don't support transparency, that shouldn't be an issue.
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