ZM24 -zigbee antenna
zrp6
t4z running 2.4 Firmware

So this is the problem.

First button press turns system on -works 100% all the time

Second page/button press is a option of all the different sources.

CATV is the problem
You press cable TV everything switches as planned and the page flips (the page flip is the LAST item of a system macro)

Once the CATV controls (numbers, channel, Etc... all of them) are on the screen they don't work for the first 10-25 seconds then they are fine like there was no issue at all.

If you toggle sources there is no delay...if you shut down and turn it back on to CATV the problems back...

I have looked at every possible thing I feel so I am just looking for a possible hint :)

How long is your CATV macro? Sounds like when you hit the CATV button, there is a long macro that is tying up the ZRP6 until it's done.

I assume your system macro is sitting on the ZRP, post a screenshot.

But if the pause was long, the page wouldn't flip until the delay finished as he said its the last step in the macro? Or am I missing something?

Can you still press the buttons? If so, does the emitter on the cable box send IR in that period of time?

Depends on how it's programmed. If you have a 15 step macro with a 1 second delay between commands sitting on the ZRP, but a 10 step macro of page flips with a 1 second delay between flips sitting on the t4, when the t4 jumps past it's last step, you will still eb locked out of the ZRP6 for 5 seconds, give or take.

I put all of my programming for macros on the processor, so the handheld device only works in standalone mode for page flips and single commands (pause, play, etc)

If you are using something besides an XP8, nested macros can become a problem because of the timing.

Without knowing how the ZRP6 is programmed, i'm just guessing here.

Are you using a cable box? will it respond to commands for the first 25 seconds after a power up? Or TV if not.

For example, some LCD's and projectors won't take commands for a period of time after a power on command.

How about an equipment list.

I think you have a long turn on delay in the RP6 you havent acounted for in the T4 programming.
Send me the file if you like and I can have a look right now while I am waiting for somebody to arrive. sales at theinstallationspecialist dot com dot au
Dont know why I bothered doing that, I think every spammer in the world has my email right now.

A long delay embedded in a system macro or just a long system macro that is being called in a standalone macro.

You don't provide enough info.

If your button is programmed in standalone mode, the remote will execute each step of the standalone macro one after the other with no regard to the duration of any system macros called. This includes your page flip. Since the ZRP6 is a single thread processor, once one system macro is under way, the processor will ignore other incoming triggers until the active system macro finishes. I am guessing this is your problem.

You actually need to be careful how you program macros in standalone mode. If you call two system macros in a row from the processor and dont give enough time between them, the RP6 will completely ignore the 2nd command. The XP-8 will buffer this so less of a problem.
Once 2 way came out I started building my macros inside the remote button programming once more. This way there is no discrepency with macro timing between the devices and no need to build two sets of delay for each event.
Because the device is connected and communicating at all times I see no reason to isolate non critical macros any more.