What is impact of disabling bitmap caching and how to prevent it?

Hi,

I'm connecting to different windows machine at the same time using the latest
version of rdesktop (as provided by Ubuntu 9.04) and I get the following warning:

WARNING: Persistent bitmap caching is disabled. (The file is already in use)

It seems that all instances of rdesktop are trying to share the same cache file in
~/.rdesktop/cache.

What is the impact of disabling bitmap caching? And is there a solution to make
sure it is always enabled?

Thanks,
Manu

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