I am with u. The source of the described issue can not be the mod. I didnt expect u to solve the problem, i just wanted to let u and this mod-using-community know what i found.
As the issues i have with win10 are identified in correlation with many many different apps (e.g. dropbox and different anti-virus-apps can cause that problem as well) i rather extinguish problems with any kind of interface, that Microsoft (not u) hasnt fixed yet. So again, i dont want to shift the problem onto u. In my special, maybe unique case, deinstalling the Modpack let me get rid of the symptoms, but in the end surely didnt fix the problem itself.
So if there will be anyone in future, who has the same problems, the one may get some infos out of this article...nothing more, nothing less.
Btw...for the ones that see the problem, too...i found that none of the mods itself, but the installer triggers the missing taskbar-functions. So installing the needed mods manually may work fine (didnt test them all, only the ones i use).