errors while using the mouse wheel (and I'm sure other things).
The error is "window.A_TCALSIDX is undefined". In calendar_us.js, it is on line 307 in the f_tcalHideAll function.
One fix is to add
if(typeof window.A_TCALSIDX != "undefined")
right before the for loop to verify the variable is defined.
I know I'm being lazy to just add it to the global header, but its in an internal application and is used more often than not.