strange, mine did work well, albeit it was an upgrade from 44.3 to 45.1
also included flash usage to see how much free space you usually ought to have with a clean setup. this one has almost literally no config in it:
/interface bridge
add name=bridge1 protocol-mode=none
/interface ethernet
set [ find default-name=ether1 ] speed=100Mbps
set [ find default-name=ether2 ] speed=100Mbps
set [ find default-name=ether3 ] speed=100Mbps
set [ find default-name=ether4 ] speed=100Mbps
set [ find default-name=ether5 ] speed=100Mbps
set [ find default-name=sfp1 ] advertise=10M-half,10M-full,100M-half,100M-full,1000M-half,1000M-full
/interface bridge port
add bridge=bridge1 interface=ether2
add bridge=bridge1 interface=ether3
add bridge=bridge1 interface=ether4
add bridge=bridge1 interface=ether5
add bridge=bridge1 interface=ether1
/ip dhcp-client
add dhcp-options=hostname,clientid disabled=no interface=bridge1
/ip ssh
set allow-none-crypto=yes forwarding-enabled=remote strong-crypto=yes
/system clock
set time-zone-name=Europe/Budapest
/system identity
set name=1.icp
/system logging
add prefix=XXX topics=script,debug
/system routerboard settings
set auto-upgrade=yes
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