The Kunena team has announce the arrival of Kunena 7.0.4 [K 7.0.4] in stable which is now available for download as a native Joomla extension for J! 5.4.x/6.0.x. This version addresses most of the issues that were discovered in K 6.2 / K 6.3 / K 6.4 and issues discovered during the last development stages of K 7.0
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I had a second domain on the same server (mac-amstetten.net), here is all ok. The second Domain is a fresh installation (2 Weeks ago), trans-it.at ist around one year old and jommla is updateted via patch.
Try to disable all modules/plugins and re-enable all this modules/plugins one by one by testing each time, if the preview works, like you can determine which thing broke the kunena preview.
I don't provide support by PM, because this can be useful for someone else.
