Firewall & Alias not working after upgrading to 2.50

[fusionp]

Hello,
I have an Alias set with network block lists, they have been working perfectly for the last few years. Two days ago I upgraded to 2.5.0 from 2.4.9(or 2.4.8) and at the same time I installed PFblockerNG-Devel.

I started having issues with rules sending traffic to certain Wan's (mutli-wan setup) stopped working. So I removed the PfblockerNG and rebooted the router. I was still having the issue where one of my rules for sending a particular servers traffic out one WAN interface was being ignored and the traffic was going out a different gateway, I deleted and recreated the rule which fixed this.

However, I have an Alias of subnets that I block, it is now being ignored, I see hack attempts on my SIP server from subnets that are on my list. I've deleted and recreated the rule, I've even tried creating a standard rule that blocks just one of the offending subnets and applied it directly on the WAN interface....traffic is still passing through from the blocked subnet.

My firewall maximum table entries is 2000000 (2 million)
Firewall states max is 1602000

What else could I check? Any help much appreciated.
Tx