Yeah, this is related to the breaking tooltip changes in JSP v2.4.1 and later. I just had a quick poke around at the code and I thought the use of sizeInitialized variable inside the main on_size function prevented the fonts/tooltips being set more than once. I didn't realise that resizing the entire panel over/below 3000 pixels wide reset the variable to false which means the call to set the tooltip size is made again which is not permitted.
It can be "fixed" by editing Georgia\js\georgia-main.js line 41
g_tooltip = window.CreateTooltip('Segoe UI', scaleForDisplay(15));
g_tooltip.setMaxWidth(scaleForDisplay(300));
g_tooltip.text = ''; // just in case
replace with
if (!g_tooltip) {
g_tooltip = window.CreateTooltip('Segoe UI', scaleForDisplay(15));
g_tooltip.setMaxWidth(scaleForDisplay(300));
g_tooltip.text = ''; // just in case
}
However, this does mean the tooltip size won't change when the rest of the layout does. Only reloading the panel would fix that.
SMP doesn't have this issue so waiting for that is probably the best bet.