Hi Rob,
Apologies for the delay in responding, this isn't my area of expertise
However, the log provided does show that PF3 received your hotkeys (as confirmed by the beeps) and responded as follows:
Tuned to Clearance on 121.97:
Response from ATC: KLM 1018 cleared to Echo Hotel Alpha Mike Climb and maintain Flight Level 70 Squawk 6241
Tuned to Ground on 121.7:
Response from ATC: KLM 1018 push and start approved Heading South West Report When ready to taxi <This occurs twice>
Request to ATC: Ground KLM 1018 request push and start <This is unusual, the pilot isn't muted like the other requests>
Response from ATC: KLM 1018 push and start approved Heading South West Report When ready to taxi <This occurs twice again>
I think that for some reason you are not seeing the responses from PF3/ATC - can you confirm that this works correctly without Voice Attack running?
I hope that this helps,
Martin