My last two rides did not save although it said they were saved and I accepted it. They do not show in my activities, Strava or anywhere. It seems they have vanished. Has anyone else had this problem? If so, why is this happening? Thanks
It is a common problem, but is usually intermittent. Sometimes the rides turn up eventually, sometimes they don't.
In the Bkool program on your computer (not the website), you can go into Settings, then About App. There is a line "Completed sessions remaining to send" which might show a number other than zero. If it does, it means the missing sessions didn't upload properly, and might be recoverable.
If it shows zero, then your computer sent the files to Bkool, and they're probably lost for ever. I say 'probably' because in some cases the rides suddenly appear quite a few days after you sent them.
As to why it happens - it must be some fault in the uploading process on Bkool's server. There is nothing you can do at your end to cure it. As you say, the extension lead shouldn't make any difference. Even so, I'd try a dummy ride (just a couple of minutes, to create some data) not using it and see if it uploads properly. Then try a dummy ride with the extension and try uploading that.