Did you try disabling wccp on router as well as WAE and re-enable it on router and then WAE and see if that makes a difference? If you have already done that and since as per documentation MASK assignment is supported in version you are running on router and it was working prior to upgrade, i would suggest capturing WCCP communication i.e HIA and ISU and opening a TAC case for further investigation. Did you follow the procedure as suggested in release notes during upgrade?
Central Managers running Version 5.1.1x can manage WAEs running software Versions 4.2.1 and later. However, we recommend that all WAEs in a given WCCP service group be running the same version.
Note All WAEs in a WCCP service group must have the same mask.
To upgrade the WAEs in your WCCP service group, follow these steps:
Step 1 You must disable WCCP redirection on the Cisco IOS router first. To remove the global WCCP configuration, use the following no ip wccp global configuration commands:
Router(config)# no ip wccp 61
Router(config)# no ip wccp 62
Step 2 Perform the WAAS software upgrade on all WAEs using the WAAS Central Manager GUI.
Step 3 Verify that all WAEs have been upgraded in the Devices pane of the WAAS Central Manager GUI. Choose Devices to view the software version of each WAE.
Step 4 If mask assignment is used for WCCP, ensure that all WAEs in the service group are using the same WCCP mask value.
Step 5 Reenable WCCP redirection on the Cisco IOS routers. To enable WCCP redirection, use the ip wccp global configuration commands:
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