Charts don't display in iOS App (OK in browser)

Raspberry Pi 3 Model B Rev 1.2
Openhabian v2.5.1-2
iOS App: 2.4.0, running under iOS14

I’ve had OpenHABian running since February after upgrading from earlier version, and it’s been running since without issue. I recently changed from Android to iPhone running iOS14 and the latest OpenHAB app v2.4.0 and the charts don’t render.

The chart headers appear allowing selection of chart interval, but no no lines/data appears, even after waiting minutes (when charts usually appear in seconds). I’ve tried tweaking of local/remote URL settings as per this thread, with no success.

Through all other interfaces (Classic UI browser, Basic UI browser) render charts as expected, which points me to assume it’s not a sitemap issue. Charts are basic line charts pulling from mysql db, and there’s no issue with the data storage since they render through other UIs:

					Frame label="Charts" icon="line" {
						Switch item=Chart1_Interval label="Real-time" icon="line" mappings=[0="1h", 1="8h", 2="1D", 3="1W"]
							Chart item=Chart1 service="mysql" period=h refresh=300 visibility=[Chart1_Interval==0, Chart1_Interval=="Uninitialized"]
							Chart item=Chart1 service="mysql" period=8h refresh=300 visibility=[Chart1_Interval==1]
							Chart item=Chart1 service="mysql" period=D refresh=300 visibility=[Chart1_Interval==2]
							Chart item=Chart1 service="mysql" period=W refresh=300 visibility=[Chart1_Interval==3]

						Switch item=Chart2_Interval label="Daily Totals" icon="line" mappings=[0="1h", 1="8h", 2="1D", 3="1W"]
							Chart item=Chart2 service="mysql" period=h refresh=300 visibility=[Chart2_Interval==0, Chart2_Interval=="Uninitialized"]
							Chart item=Chart2 service="mysql" period=8h refresh=300 visibility=[Chart2_Interval==1]
							Chart item=Chart2 service="mysql" period=D refresh=300 visibility=[Chart2_Interval==2]
							Chart item=Chart2 service="mysql" period=W refresh=300 visibility=[Chart2_Interval==3]

My events are showing various entries as below, however from other threads this appears to be unrelated to the charts rendering issue;

2020-11-05 10:17:43.711 [WARN ] [io.openhabcloud.internal.CloudClient] - Jetty request 14648028 failed: null
2020-11-05 10:17:43.713 [WARN ] [io.openhabcloud.internal.CloudClient] - Response Failure: null

Any suggestions are welcome :wink: