Submitting changes in EM admin often results in blank page

I’d suggest you check out your PHP error logs to see what’s going wrong if you get blank pages.

Also, it may be worth temporarily disabling other plugins or revert to the default theme to make sure it’s not one of them causing a conflict.

This is not normal behaviour.

same as my other post – gone with 256M memory.

can you share the error logs?

answered you here:
https://www.ads-software.com/support/topic/em-breaks-ajax-on-admin-bp-gravityforms?replies=8