Since a few weeks i've got a little problem. Whem i'm drawing a landscape somtimes my dimensions disappear. I've tried different views, different perspectives but nothing works. Also when this happens i'm not able to use my dimension tool anymore. So to me it looks like some sort of bug, but 've got no clue at all.
Has anybody encounterd this before?

Thanks in advance, Richard

(i've been a sketchuppie for a few years now but this is the first time i've used a forum, till now i've been wasting a lot of time attempting to work out things on my own, how stupid is that )