I just upgraded to 4.5.1, which went smoothly enough, but now things that are apparently detected as being spam are ending up in my inbox.

Example headers:
Code:
X-DSPAM-Result: Spam
X-DSPAM-Confidence: 0.9997
X-DSPAM-Probability: 1.0000
X-DSPAM-Signature: 45cc90a582151385515324
X-DSPAM-Factors: 15,
X-Virus-Scanned: amavisd-new at 
X-Amavis-Alert: BAD HEADER, Non-encoded 8-bit data (char AC hex): Date:
	\254P\264\301\244\255, 09 \244G\244\353 ...
X-Spam-Flag: YES
X-Spam-Score: 7.424
X-Spam-Level: *******
X-Spam-Status: Yes, score=7.424 tagged_above=-10 required=4
	tests=[BAYES_99=3.5, DNS_FROM_AHBL_RHSBL=0.231, DSPAM_SPAM=1.5,
	INVALID_DATE=2.193]
Code:
X-Virus-Scanned: amavisd-new at 
X-Spam-Flag: YES
X-Spam-Score: 10.312
X-Spam-Level: **********
X-Spam-Status: Yes, score=10.312 tagged_above=-10 required=4
	tests=[BAD_ENC_HEADER=3.1, BAYES_99=3.5, DNS_FROM_AHBL_RHSBL=0.231,
	HTML_IMAGE_ONLY_24=1.841, HTML_MESSAGE=0.001, URIBL_SBL=1.639]
Spam checking is turned on in the console, tag and kill %ages look right (20/75), and it's clearly detecting them as spam -- why are they ending up in my inbox instead of my Junk folder?

Mike