Graphics - intermittently loosing 3D rendering or getting random blocks

[Lucy]

I have a problem with my Labview 7.1 runtime application that may be actually be a Windows, Video Driver or PCAnywhere problem but I am checking in the Labview forum in case it is actually a Labview issue or others have seen this.

I have several remote monitoring systems, based on standard Industrial PCs with Windows 2000 each with their own local kvm display. I connect to these systems daily to collect data, check and develop the software. I use PCAnywhere for the flexibility, but lately I have upgraded to PCAnywhere 11.5 and I have been experiencing problems with the video graphics, that are mirrored on the local display. Firstly the 3D graphics looses its nicely rendered edges and looks like a very low res, low colour. This is not always cleared by changing the display settings. It just doesn't look so good but the display is still readable. A worse problem that occurs is that the display converts into random blocks, obviously based on the original screen but not coherent. Both problems appear to start when the connection is made and may clear up randomly or need a complete reset to be cleared.

Advice so far has been that we need the latest video drivers but we believe we have them.
Has any of these issues been reported by other Labview users?

Thanks

Lucy

[altenbach]

It seems to me that the graphics compression algorithms of PCanywhere take some shortcuts to save bandwidth. I am not familiar with pcanywhere, but maybe you can change some compression settings if you have a fast connection.

(Personally I am using VNC (e.g. tightVNC) and the settings are quite adjustable).

[Lucy]

Thanks for the prompt answer. Yes there are a couple of video preference settings, and I have tried the settings that seem to use less compression. - I didn't get this clear simple advice from the vendor.
(We are using the file transfer facility as well as taking control, so don't know if VNC does that?)