"J. P. Gilliver (John)" wrote

| Having said that: I just got one of the manifestations of the weirdness
| while I was typing the above paragraph, I turned AllChars off (didn't
| uninstall it), and I got my typing back! So, more investigation needed.
| I've just turned AllChars back on, and I can still type - including
| éû?" the odd characters AllChars makes it easy to type.

That could fit with a bad hook. It depends on how they
designed it. Problems might not necessarily seem consistent.
For instance, if the hook didn't pass on the message after
certain keys only, due to an oversight, then you could see
erratic behavior.