I have one Cisco 7600 connected to others Juniper's (M20) routers in this fashion:
Cisco 7600 (PE) <----> Juniper M20 (P) <---> Juniper M20 (PE)
My 7600 have SUP720-3BXL and IOS version 12.2(18)SXF7.
I don't have problem when MPLS-TE tunnel between Cisco 7600 (PE - Headend) and Juniper M20 (P - Tailend) is used.
However, when MPLS-TE tunnel between Cisco 7600 (PE - Headend) and Juniper M20 (PE - Tailend) is used the delay increase and drop occur.
Any another MPLS-TE tunnel originated in Cisco router and with more than one hop to any another Juniper PE have the same problem.