I installed JIRA 6.1.3 and it worked smoothly. Integrated with Crowd and everything. Even restarted the server without any problems.
However, today, after installing Agile and Capture plugins server doesn't restart properly, it locks down with log file full of plugin errors. This specific problem has happened since Thursday, making me install JIRA for 4 times already. On Thursday, finally I just installed it fresh, and then shut down the server (an AWS instance). Today I restarted the instance, JIRA opened as normal, without any plugins installed. I installed Agile and Capture again, plus Balsamiq Mockup addon. Plugin system reported successful installation, indexed plugins as well. But after service restart, what had happened before happened again: tons of plugin errors and locked down JIRA.
Any idea how this can be solved? I can provide server access if needed, since all it has is Atlassian tools installed.