I have upgraded my Etcher installation this morning and encountered an issue with writing an image to an SD Card - specifically that the device/drive selection step appears to accept and then immediately cancel the choice within the GUI ~ see shot below for better description 馃槃

Workflow prior to upgrade:
Insert SD Card into reader
Close Win10's 'Please Format Drive' prompts
Launcher Etcher
Select image file (including .ZIP archived images)
Select USB Card Reader
Click 'Flash'
Etcher would then in chain of actions, Format the Drive(s), Extract the image, Write the image, Tidy up, Eject SD Reader.
Since the upgrade I'm unable to proceed past the 'Select Drive' stage.
Screenshot of Etcher_Console, below.

Hope this helps - let me know if you need anything further etc.
Many thanks,
Richy.
Same issue here on Mac OS 10.13.4 with the same version.
Same on ubuntu 17.10
same issue. going back to 1.3.1!
What happens when you double-click?
it keeps deselecting even when you double click.
Same issue with 1.4.3 on MacOS 10.13.4. If i double click the drive selection window popup closes but without having selected the drive.
Went back to version 1.3.1, problem is gone.
If you go faster than the GUI, you can actually flash the ISO, so is confirmed is just a UI problem
I wish I were as fast as you :-)
I've identified the issue and fixed it in the above PR. We'll have 1.4.4 out shortly.