Visio 2007 does not display dimension data

In Visio 2007 you can display dimensional data most shapes particularly lines, squares etc. I have installed video 2007 on my Windows 7 machine and there were no issues with the installation but it does not display any dimensional information. I have the same software running on a Vista machine with no problems. Has anybody got any suggestions as trolling through the various support sites has turned up nothing so far.

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