Disappearing Architectural Ticks!

Using dimensions, when I select architectural ticks in the arrowhead options, the ticks disappear. Closed, Dot, Box all work but not
architectural ticks. Arrow size has no effect.
Can anybody help?
Ian
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Ian Robinson wrote:

by any chance has the block "_Oblique" become redefined? (or erased)
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You may want to look at your dimension scale. It may be too large for the ticks. Sometimes if the scale is too large a leader arrow will not show up unitl you are far away from the initial selection point. Just a thought.

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