Tom from SWISCO responded:
October 13, 2016
If the shoe isn't damaged, try spraying the track with silicone and seeing if that helps. If not, then it may be time to replace it. Though, I just had a thought: is the shoe jammed while the sash is installed, or only while it's out? Shoes lock into place once the sash is removed. You can unlock them by manually turning the cam with a screwdriver. Just be careful, as they're under pressure from the balance and will likely shoot up, so keep a firm hold of it.
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