The jump happens if codetool cannot parse the source. It jumps to where the source is unparsable. The message window should give more info.
You can go back with Alt-H.
You can switch off the jump: Tools > Options > Codetools > Identifier Completion: "Jump to error"
But even if it does not jump, it may not be able to show you the completion list. You still need to look at what it says in the messages window.
I also suffer from this problem.
This problem did not occur in version 1.8
The code is compiled and executed normally, but Ctrl + Space does not work.
Every time this happens, I have to restart the IDE.
In the console the following message is displayed (message in PT/BR).
"Error: Final do fonte não encontrado."
@edit
When I try to access an event through the Object inspector, the following error is displayed:
"Incapaz de exibir método. Favor corrigir o erro mostrado na janela de mensagens, que se localiza normalmente abaixo do editor de código."
@edit2
Another problem I see is a "duplication of methods".
When I press Ctrl + Shift + C (sometimes automatically) the editor creates the methods again.
I can not simulate this problem intentionally. But it occurs several times a day. It's very annoying.