Yeah, I used a POA to sale my father's house in AZ. This was a year ago. I had no issue. I have wondered if I needed a POA in OR where he now resides. With this said, the facility has accepted the original. If I remember correctly, the POA does have a expiration date for the notary. This may bring an issue as well. So, I do not know myself, and perhaps others can chime in if a POA needs to be completed after a period of time.
I personally have taken over my father's finances completely. I chose this since if anything occurs I do not need to liquidate accounts under his name. I simply have his funds. I do have custodial account with Wells Fargo with both our names to receive pensions. Originally, to get all of this it was a pain, but I have it dialed in now.