Not sure I am reading the device log correctly - but one entry is in bold that says "E ApplicationTrustLevelManager - EIMI" and when I click on that heading it says "error" on the Severity line.
Try enabling the compatibility mode for it (options>advanced>applications>highlight (do not open) Quick Pull>BB Menu>enable compatibility mode (or disable if it already says enable).
There is a fix out there for this. Forgive me for not searching for it because I'm not on a PC. If I remember correctly it has something to do with the email permissions being in conflict. Anyway I did that fix and its worked fine ever since.
Posted from my CrackBerry at wapforums.crackberry.com
Options/Advanced Options/Applications highlight "Email Setup Application" click Blackberry button and select "Edit Default Permissions", set everything to "Allow" do the same thing with the Quick Pull application to ensure it is all set to Allow.