The middle screenshot is suggesting a mismatch between 32 and 64 bit architectures.
Assuming default locations are used, if Monarch in in the 'Program files' folder, it will be 64 bit. If it is 'Program Files (x86)' it will be 32 bit. The driver in use is 64 bit (according to the lower screen shot), and must match the bit level of Monarch
This could have changed over the last 4 weeks for many reasons, including
A reinstall of Monarch at a different bit level
A reinstall of the Postgress driver at a different bit level
A new or reinstall of any application that may have also (silently) changed the bit level of the driver