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The delays in SpaceX’s commercial launch schedule appear caused by a series of problems testing the first stage’s upgraded engines.
The article also provides this updated scheduling information:
A successful test will be key for several of SpaceX’s future ambitions, not least their upcoming increase in launch frequency, with the next Falcon 9 – the debut of the v1.1 – set to loft Canada’s space weather satellite, CASSIOPE, out of Vandenberg Air Force Base. This mission has officially slipped to August, with the likelihood it will be re-targeted to September. Focus will then switch to Cape Canaveral, with two satellite missions, the first carrying SES-8, to be followed by the Thaicom 6 launch.
I had suspected the delays were related to the upgrades to Falcon 9. This article confirms this.