Sequence won't play in cloned drive.

Hi everyone, 

I cloned a drive I was working from to a bigger drive because I ran out of space in the first one to add new footage. 

I relinked everything without issues as the new drive kept exactly all the same folder structure. 

I can open all my source clips and multi-cams normally - they playback linked to the source and also linked to proxies, so clearly the relinking worked. 

However, when I try to open my full sequences they won't play. Either the record monitor is black or pending media, and nothing happens. 

Already cleared the cache data and the problem remains. 

It's the most updated version of Premiere. 

It won't let me export aafs or xmls. 

It won't even let me copy the sequence to a new project which is concerning me.