I purchased BTStack Keyboard, and it seems to work in text message,
email, but not in other apps. For example, in Safari, I can't type more
than one character on google search box. If I type Hi, it only accepts h and nothing else. It doesn't work with on-screen keyboard either. How can I fix it? Btw, I power off and power on the phone after the installation. Thanks.

just found a bug in key injection code which could be a cause of that. The fix will be submitted to Cydia in the next 24h. When you try it out please send me a feedback if it works for you.

Ok. another if not the same bug was identified. Update will come after the weekend.

please try the 1.0-23213 update and report back

the update is out now. please try the 1.0-23213 update and report back

the two other issues have been resolved by 23213, this is a duplicate