Channels missing from on-screen guide
A relative in Montreal has Bell Fibe TV and some channels don't appear in the on-screen guide. Some are subscribed, some not. This has been an ongoing problem but became more acute when we changed their channel lineup today.
For example, the on-screen guide jumps from 332 to 390 (and from 1335-1339). So there's never program info for Silver Screen Classics (337), to which they subscribe. I'm sure most of the missing channels are ones they don't get, but this is happening even when unsubscribed channels are visible (e.g. we see FX, FXX, which aren't subscribed). Clicking "up" when scrolling through channels also seems to skip SSC, but entering "337" tunes it.
It just became more acute when they subscribed to TCM. Neither SD or HD (338, 1338) is visible in the guide, so of course you can't record it in advance. I _am_ able to see both SCC and TCM in their Bell "online PVR" and set recordings but it's awkward and not something the relative can do.
Is this a common problem? Is there a known cause and/or fix?