HP ENVY 4525 not printing colour, smudging

The first problem I had using the printer was that for photos it only printed part of the page, and the ink didn't dry. It smudged even after 24 hours.

I spoke to a very helpful technician. She said that it was only possible to print non-smudge colour photos using the old Windows Viewer, which she installed for me. Everything then worked perfectly. Until today.

Now Windows Viewer is only showing the option to print in greyscale. I have installed a new genuine HP 3-colour cartridge. The printer information shows that there is a colour cartridge installed, but it won't print in colour.

Help, please.