I seem to have the same problems as Malte Johansson described 31 January 2006 ("Diagram not correct after weekend"). I run at least 20 PLW applications in my lab (TC-08 serial, TC-08 USB and ADC-16) and some months ago the PLW running one of the TC-08:s lost the ability to show graphics correctly after about a day from start of the logging. Restarting PLW made it work well until 1-2 days later when it would be strange again. Now I have got the same problem on a laptop running WinXP (English) and a ADC-16. I downloaded the latest PLW and the problem persists (could there be something from the old version left? Should I have removed the old PLW before installing the new?)
The problem is as follows: The graph freezes, but the logging goes on and you can see the values changing in the Recorder window. You can look at the full graph by opening the Player (but this graph will of course not be updated) and the data is perfectly ok afterwards.
When the graphic freezes, the curves usually disappear and the Recorder buttons are lost from view, but they can be used as the pop-up windows for the buttons are active. The graph window goes very strange and you cannot use it at all. Sometimes part of the old diagram is left, all buttons diappear and moving other windows over the PLW-graph makes it disappear.