I will confirm with the other devs but from what I can tell this is an issue on our end with the use of a rare API entry point (`trajectory.timeseries`)
for calculating ces. A possible workaround is to use the memoryreader in a slightly convoluted way which I have attached as a jupyter notebook.
Basically we have to load the trajectory into the MemoryReader (see here
import MDAnalysis as mda
from MDAnalysis.coordinates.memory import MemoryReader
from MDAnalysis.analysis.base import AnalysisFromFunction
from MDAnalysisTests.datafiles import PDB, XTC
u = mda.Universe(PDB, XTC)
coordinates = AnalysisFromFunction(lambda ag: ag.positions.copy(),
u2 = mda.Universe(PDB, coordinates['timeseries'], format=MemoryReader)
If it is an issue I will sort out a fix ASAP but can't make any promises about the timeline.