There's several possible kinds of issues:

1. Client issues. Please report them to your client bug tracker (for example, qTox bug tracker, Toxy bug tracker or uTox bug tracker).
2. Packaging issues. If you have troubles with your Tox repository, please report them to the infrastructure mailing list at infrastructure@lists.tox.chat, or directly to the administrator at admin@tox.chat
3. Issues with the Tox core library should be reported to the toxcore bug tracker. Do not report an issue to toxcore if you are not entirely sure whether it's a core issue. Instead, report it as a client issue.

There are antiviruses that report Tox as false positive. If you did get Tox from official Tox website, and your antivirus causes problems and is not in the list please say that antivirus causes problems. Additionally, you could report to your antivirus makers that Tox is reported as false positive when it should not be.

Unfortunately, current Tox groupchats don't support saving, moderation or joining without invite. The New groupchats, which are still in development, will fix these issues.

Tox messaging of all kinds(including Friend Requests) requires both parties to be online at the time the exchange takes place. Try to make sure that both computers are connected to the network when the friend requests are made.

In order for a friend request to complete:

1. Other side has to be online to receive the Friend Request.
2. Other side has to accept Friend Request after receiving it.

If you are sure that other side was online when you sent the Friend Request, and they did not receive it, please report it.