Imbedded images randomly disappearing

Hello community - we're working with Telligent support on this, but they have not been able to locate the cause yet. Has anyone else experienced a problem in version 10.0 where images imbedded in content like forum replies, wiki articles and blog posts suddenly disappear? We have mainly noticed it in forum replies - essentially the imbedded image appears when the reply is first posted but at some point later (possibly within 24 hours), it disappears from the site and a black X is shown in its place (in IE). In the file storage section of the application, the file is simply gone with no trace. This appears to happen randomly and we cannot determine the pattern or cause.

Here is an example

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