Distribution/Version: XP, SP2

1: Start Dia.
2: Open file LinearP4 (I will try to attach it to this report)
3: Press ctrl-E, for 'show all'.
4: Click mouse on the text '2', on the lower left part of the screen. The text 
now changes apparent size, reducing to approximately 1/5 of the correct size 
(becoming difficult to read).

Expected behaviour: Text should never change size, except if explicitly 
modified by right-clicking, bringing up the properties dialog, and making the 
change.

Further details: If the document is closed, and then reopened, the sizes of 
other texts are also rendered wrong. If Dia is exited, and restarted, and the 
file is opened again, it shows correctly this time. The size is also sometimes 
fixable by adding a trailing space to the text in question. 

Also, when I inspect the LinearP4 file manually, I can see that the text-sizes 
are in fact correct in the file.

The 4 steps at the top of this description are reproducible every time.