I am using version 6.0.4.2 (x64). In Base, I can create a report and spend time making it just like I want, but if I ever close it, it won’t open again. No error message. Nothing. Double-clicking on it does exactly nothing. Right-clicking on it doesn’t give me an option to edit it (I could delete it or rename it, but what I really want is to make a small modification and print it, and it steadfastly refuses to allow such things). It becomes a completely useless icon. And when I write “nothing,” I mean nothing: no hourglass mouse pointer; nothing; zero; zip; nada.
Hello,
Not having any problems with v6.0.4.2 on Linux Mint using reports in any way. Try running Base in Safe Mode. Open Base. Then from menu select Help->Restart in SafeMode. If that works you most likely have a problem with your user profile. To reset see this post → LibreOffice user profile.
If you want, from my answer in this post → help with grand total, download the Repaired DB - ModelRR.odb and try to run the report there. If it runs or you can edit it then the problems lies somewhere within your constructed report. Would need a sample of your .odb (without personal or confidential info) to see if can be any further help.
If this answers your question please tick the 
(upper left area of answer). It helps others to know there was an accepted answer.
I was able to make it work, sort of. I installed the Oracle extension for reports. That made the report editor throw an error, so I removed it. After that, I could create reports and then edit them.