We are running JIRA (v4.4.3#663-r165197) with the JIRA Subversion plugin version 0.10.5.4_01. When i click the 'Subversion commits' link, the entire Activity box disappears.
The JIRA Subversion plugin compatibility chart shows that 0.10.7 should be used with JIRA 4.4. You should upgrade the plugin.
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