If a text style only exists in your drawing within a contour style, AutoCAD’s purge command considers it unused.
Workarounds: Create your contour stiyles using a text style that you know will never be purgeable.
First Appeared: Land Desktop 2 (2000)
Status as of 2008: Still reproducible
Status as of 2009: (unknown)
It appears that when PREVIEWEFFECT is set to a value which allows thickening (1 or 2) then short MTEXT entities observe this setting while larger MTEXT entities do not. Unfortunately, when moving the cursor over the entities that do observe the “Thicken” setting, performance noticeably hesitates.
Workarounds: Change PREVIEWEFFECT to 0
First Appeared: Land Desktop 2006
Status as of 2006 SP1: Still reproducible
Status as of 2007: (unknown)
Status as of 2008: (unknown)
Status as of 2009: (unknown)
After sampling existing ground, going to PROFILES / CREATE PROFILE / EXISTING PROFILE yields an error, “Error reading surf_head for VRT file”.
Workarounds: This bug seems to be drawing specific rather than project specific or user specific. There are several theories in Autodesks discussion groups. The only time that I encountered it, I was able to correct it by deleting that drawing files CGX and DFM files.
First Appeared: Land Desktop 2 (2000)
Status as of 2008: Still occurs
Status as of 2009: (unknown)
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