Over the years I have built many script tools to run in Arc Toolbox within ArcMap. These tools have run fine for years with no issue. Several months ago (or maybe longer) I noticed often when I double-click the script to to open/run, there is a new message that Ive never saw before that says ' Click error and warning icons for more information' (see screenshot below). However, there are no errors or warnings (when I click the yellow ribbon it goes away). What is more problematic, some script tools that have lots of parameters now take extremely long to initialize (i.e. just open the form with the parameters) - sometimes as much as 7+ minutes. Most of these tools do not have any special validation defined (in 'Validation' tab), so not sure why it takes so long.
Any thoughts/pointers on what may be contributing to this would be greatly appreciated. I am running ArcMap 10.6.1 on Windows 10 (but that hasnt changed for a few years).