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Originally Posted by BetterRed;3583647...Can you post which Windows 10 you use, mine is Windows 10 Pro version 1703* up to date as of now.
@[B
John[/B] - it would be interesting to know if 32bit PDF XChange suffers the same fate - but I have a feeling its msi combines 32 & 64 bit and it decides which one its going to install. Maybe there's a separate 32bit download.
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This machine I have been referring to is up to date Windows 10 Pro 64 bit Core i7 2.4GHz 16GB.
I tried PDF XChange as requested. Today on this i7 PC it is not doing the two button trick with PDF XChange

whereas it was doing so yesterday. Now I do not normally have it on the taskbar so have not really taken much notice of the behavior in the past but I am sure that I have noticed it doing so prior to yesterday too. However, I have today been running a couple of applications which do a lot of startup tasks opening and looking for data and audio on Ethernet and USB ports, crunching and painting it, etc. and wonder if that had conditioned Windows timing starting applications in some manner (long shot, I know).
Throughout all the above if I ran Calibre from the taskbar I always got 2 buttons on the taskbar (and best I can remember I have for a long time). In the end it is only a cosmetic issue and has never troubled me.
To see what happens on slower machines and to also meet BR's 32bit request I set up 2 old PCs both up to date Windows 10 Pro, one Core Duo 3 GHz 64 bit and the other Core Duo 2.1 GHz 32 bit with applications on the taskbar. On both PCs PDF XChange did not display the two button issue, nor did any other application I tried including Calibre.
So, after all that, I wonder if the issue is limited to faster PCs (I think all fast PCs are 64 bit these days so unlikely to be able to test a 32 bit fast one?).