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When you select Go! on the solver or Shift-G in the phase view, all the phases are cleared (unsolved) and then re-solved starting at the root phase. (Again, if there is
no root, then the phases will not be used at all in the solve. This can be helpful for quick experimentation.)
When you double-click on the solve tab at the upper-right corner of a phase, it causes that phase to be run. The phases that it uses will only be run if they have not previously been run, or have been changed since that time. If those other phases have a valid solve (a green solved tab), then they will not be solved again, which saves time.
The phases keep track of whether they have changed and need to be re-run based on the parameters of the phase. If you make changes in the main interface that turn out to affect a phase's operation, you need to make sure the phase is cleared so that it will be re-run. (For example, a solve phase that does not have a Set Solver Mode in front of it: if you change the solver mode in the main Solver control panel, the solve phase's earlier solve data is no longer valid, but that is not apparent to the phase.)
You can force all the phases to be cleared with right-click/Unsolve, or clear a single phase by right-clicking it and selecting Unsolve this.
It is always safest to do a full solve via Shift-G (Run All) once you have set up the appropriate Clean Start elements for what you are doing.
You can review the output of a series of phases, after you have closed the popup solver dialog, using the Solver Output View.
If you have a complex series of phases and are not sure what the solve pipeline contains at some intermediate phase, you can right-click it and select Retrieve from this, which reads out the phase's solve data and loads the data into scene. Note that the readout data consists primarily of path and position data, not the details of the various mode controls. See the Phase Reference for details of what is read out.
If you want to "hide" some trackers from a given Solve phase, so that they do not influence, make them Zero-Weighted-Trackers (ZWTs), using the Tracker Modes phase.
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