Delete function in Bridge not working correctly - version 10.0.4.157 on Windows 10 Pro

Here's a strange one. I can delete some image files from my SD card in Bridge and not others, and it seems to depend on when the images were shot. For example I have a DCIM folder on my card created by my camera. I can delete all images taken yesterday, but none taken today (and on several other dates). For those shot yesterday, I can delete either with the Delete key on the computer (PC Win 10 Pro 64) or by clicking on Delete in the context menu. For my shots taken today, the Delete key does nothing and Delete is missing on the context menu. I need some help here. I am attaching two screen grabs to illustrate. FYI I just updated Bridge today (10.0.4.157), and I have tried everything, including taking out and replacing the card, restarting Bridge, restarting the computer.

TIA
Toby

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