How strange! I can confirm that it happens for me as well. After taking a quick look and testing some things, I just added tostring() and tonumber() functions to the valuebox control and now it seems to be working normally again. I thought that I had used the valuebox this way before without the converter functions, but maybe I’m just imagining things.
Seems like tostring() and tonumber() are actually required, even when handling the simplest forms of conversion, for example: from the string “64” to the number 64. This makes sense, but I had assumed that Renoise was handling some of that basic functionality automatically, and if the programmer wanted to do more advanced conversions then they could simply replace those functions.
I guess the behaviour here could possibly be related to this.
v1.03 Update: Fixed this bug mentioned by Ashkan Asgary