Hello there
The underlying error seems to be an OutOfMemoryError Java Heap Space exception (in the server log).
I have to admit to running both server and client components on the same laptop with 2Gb of memory. However, I am not convinced this is simply a lack of memory problem per se, as the laptop is dedicated to Livecycle, the application is relatively small, and I have come across references to other people getting the same error with a much larger amount of memory.
I have followed the recommendations at
http://www.adobeforums.com/webx?7@@.59b5ffd4/0 and
http://help.adobe.com/en_US/livecycle/es/install_jboss.pdf (as far as I can), to change various settings, however I am still getting errors.
I can alleviate the problem by not saving the form too frequently (perhaps once every half an hour or so), however this doesnt get rid of the problem completely.
Any suggestions much appreciated.