Hello, I just want to add my two cents about my experience with FluCard issues (and the fix, and an idea about possible prevention).
As some others in this thread, I have for the past few days struggled with the SSID not visible / FluCard not working issue. (Now resolved.)
The issue (FluCard "lost") repeatedly surfaced in a situation when, while taking pictures (not using Wi-Fi control), the camera was set to store the photos in a RAW format (so basically two files), and these were to be stored on the FluCard. If set to JPG, all seems to work fine.
When trying to solve the problem through a notebook, the card inserted into the card slot of the computer (i.e. not in the camera connected through the USB cable) was displayed (and even that was still somewhat of a lottery) only after I plugged the power cable into a wall outlet. (When the nootebook was running on a battery, nothing happened except for some random beeps.)
Anyway, following the advice above (thank you all) and in this thread
FluCard issues - was functional, but now no connection/SSID, saving not possible - PentaxForums.com, once I finally had the "card detected" scenario, I tried to format the card using both the SD utility and the Win formatting feature. I say "tried" - somehow none of the formatting attempts was finished, some kind of error appeared almost immediately after the procedure started. (Not that I would be too surprised at this point. :) ) I suspect that the FluCard disconnected due to a higher load during the formatting.
So now I had some kind of a semi-formatted card - Windows saw it as unformatted, but it was not possible to complete the formatting in there. So I tried to format the FluCard in the camera (slot 1). And voila - this succeeded, and when inserted into slot 2, I finally again heard the familiar "setup buzzing", SSID was shown etc.
Based on my experience, I suspect that my FluCard is sensitive to (over)load and/or sufficient power supply below. If I may give an advice to anyone struggling with similar issues, depending on the nature of your problem - or actually to prevent it in the first place - consider setting your camera so it doesn't save (tries to save) RAW files on the FluCard. I think in theory, using the separate saving storage option (card 1 - PEF/DNG, card 2 - JPG) should work in such cases, but I haven't tested that. (I primarily have the FluCard for remote capture control.)