Definition of a "Known Issue"
You will see this phrase used a lot, unfortunately. It simply means:
We (authors and experienced users) know about the problem, and we are sure (from experience and consultation with the authors) that there is nothing you can do about it.
Issues listed under "core" are problems within the .exe, and cannot be fixed except by using a different emulator with a different core (do not ask the Project64 team which emulator to use, we do not know!). Issues listed under "plugin" (or "[video]") etc. are problems within a plugin and could in theory be solved by using a different plugin (do not ask the Project64 team which plugin to use, we do not know!).
If a solution to an issue is found (a big "if" - it is not likely), the answer will be added to this document, therefore if you are reading an up to date version of the Project64 GameFAQ, it says something is a known issue, and you still ask how to fix the problem, you are going to annoy people. Please don't do it.
On the other hand, If you have a solution or workaround to a problem that you want to share with fellow users (one that isn't already listed here, obviously!), please let us know via the Dev Forum and if your answer proves useful to others it will be included. Many thanks in advance.