'Undefined variable' error while trying to solve in Mathcad 14

[ptc-2122803]

I really hope someone can help me with this problem. Suddenly my mathcad started to du something weird. When trying to solve an equation involving something I have defined earlier I always get the message "this variable is undefined". But if I then just insert the size I have defined as numbers instead it works fine ... and it happens every time I try something similar. I don't know what to do, and i already tried reinstalling several times..

[VladimirN]

Hello,

Can you provide printscreen of this error in MC14? And what service release of Mathcad 14 are you using?

[ptc-2122803]

I don't know how to se what service release i am using

[VladimirN]

In main menu select "Help" -> "About Mathcad". And here your "test" example in Mathcad 15 M010:

[ptc-1656721]

Look at:

http://communities.ptc.com/message/192557#192557

[ValeryOchkov]

[ptc-1656721]

Version of the Mathcad 13.1: