What are your biggest frustrations as a project manager?

What are your biggest frustrations as a project manager?

Can be customer related, team related, senior management related, financial, schedule, etc.

Some that come to mind for me:

- Lack of adequate funding

- Poorly managed PMO

- Poor customer requirements or vision heading into the project

- unrealistic deadline for finishing the project

What are yours. Please give me at least your top 3 if you can (order doesn't matter), but no more than 5.  Thanks!  I will compile the results and get back to everyone in a March article or post.