Related to this, I've also noticed that on the windows app, the teambuilder will be stuck loading forever if you have a mon with hidden power on ANY of your teams. The website seems to handle it fine, but this will be a big inconvenience to almost all users of the windows app.Trying to use the "Import from text or URL" function doesn't work at all if any of the Pokemon have Hidden Power.
The Pokepaste URL will add the teamname, but won't add any other team data if ANY of the Pokemon use Hidden Power. Right now, the only way to import older gen teams is to remove Hidden Power from the mons kits and then manually add them back.
Bug Example 1
Bug Example 2
You'll notice that neither of these teams can be imported unless you remove HP Bug from the Heracross