Shoutbox

Simple advice: don't use the script...

For starters the script contains bugs (as you experienced) and possible bugs (in certain scenarios).

But it also does something, at least it tries, to do something which is in practice not a good way to overcome the character limit. For starters there is probably a flood protection in Messenger/protocol itself which prevents you from updating the PSM too much.

Secondly, there is a delay (which is way bigger than some milliseconds) before your contacts actually will see the PSM updating. So, in effect, they will not see your swimming PSM as you intended or want.

Thirdly, updating the PSM that often is extremely annoying to your contacts. It also requires constant data traffic as well as from your internet connection, as from the connection of your contacts...

All in all, I advice you to not use that script.

Also note that a PSM is not a book. A PSM is meant to hold some information, but it is not meant to hold 10K of texts. For normal use the maximum character length for the PSM is way big enough.

If you still want to use more characters, use an addon which is capable of boosting the character length of the PSM. But by using a script this is not possible (even if the script was bugfree, which this one is not)