@varhegyisz can you share what type of mirror did you use from the supplier?
4mm or 6mm, detective or reflective glass?
Uveges munka link

Thank you for you’re help.

After downgrading to Magic Mirror version 2.6.0 Facebook birthdays are working again.

@ianperrin thank you for helping out. I followed the instructions and now the icons are showing.

After a clean install of MagicMirror2 without any errors displayed, i wanted to set up my calendar to show Facebook upcoming birthdays like it was before reinstall, but now i got the following errors and nothing is present in my calendar:
PM2 log

TypeError: Cannot read property 'length' of undefined
    at Object.ical.objectHandlers.END (/home/pi/MagicMirror/modules/default/calendar/vendor/ical.js/node-ical.js:33:22)
    at Object.handleObject (/home/pi/MagicMirror/modules/default/calendar/vendor/ical.js/ical.js:287:41)
    at Object.parseICS (/home/pi/MagicMirror/modules/default/calendar/vendor/ical.js/ical.js:328:20)
    at Request._callback (/home/pi/MagicMirror/modules/default/calendar/vendor/ical.js/node-ical.js:11:24)
    at Request.self.callback (/home/pi/MagicMirror/node_modules/request/request.js:185:22)
    at Request.emit (events.js:182:13)
    at Request.<anonymous> (/home/pi/MagicMirror/node_modules/request/request.js:1157:10)
    at Request.emit (events.js:182:13)
    at Gunzip.<anonymous> (/home/pi/MagicMirror/node_modules/request/request.js:1079:12)
    at Object.onceWrapper (events.js:273:13)

The facebook link for the calendar is ok, i have already checked that. I can display google calendar, facebook events, but facebook birthdays are not functioning.
Does anyone else had this issue, or can help me?

After a clean install of MagicMirror2 with no errors, i also installed the MMM-Remote-Control module which is not showing the icons before menu items. Can anyone help about this issue?