after i deleted one Wire in the schematics the whole boards gets either fu...ed up or inconsistency errors occur which seem unresolvable, even with redoing the last steps to a point which was known to work.
It's hard to say what's going on without looking over your shoulder, but I've never had the sorts of problems you are describing. Even when I've managed to get a schematic/board to be 'inconsistent', I've always been able to fix it, either via undo, via fixing the individual problems listed in the ERC, or (if desparate) via the automatically made backup files.
Here are a couple hints, though:
- ALWAYS edit with both the board and schematic windows open.
- NEVER use "wire"; signals in the schematics should be added with "net", and traces on the board should be added with "route" (and deleted with "ripup")
- don't add wires or signals in the board (if you have the schematics open, it shouldn't let you.)