i have the same problem in jabref 2.7b on debian 7.8 with java 1.6.0_34:
biblatex mode with utf8 encoding works fine, but after customization of the entry types i can't edit my entries anymore. i can still create new entries though, but they're blank.
after deleting the configuration files in my home directory everything works fine again, but with the standard entry types editing is very tedious (for me)...
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i have the same problem in jabref 2.7b on debian 7.8 with java 1.6.0_34:
biblatex mode with utf8 encoding works fine, but after customization of the entry types i can't edit my entries anymore. i can still create new entries though, but they're blank.
after deleting the configuration files in my home directory everything works fine again, but with the standard entry types editing is very tedious (for me)...