The only hint from me this week is that the key length is fairly short
PGSZS QUTNV AWIYZ ENGMM RULXB JCWQW ITVDJ PCMDQ QVMZS WFPRJ PZFJU EAWAW PGAYC UTORC IVIXO EKSYE IVHKW XNHYW R
Please don't spoil the puzzle by posting a solution. Post help, by all means - but be circumspect.
A solution will appear in one week.